package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.DishDisableFailedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        // 1. 向菜品表插入一条数据
        dishMapper.insert(dish);

        // 2. 向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dish.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 分页查询菜品
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        int pageNum = dishPageQueryDTO.getPage();
        int pageSize = dishPageQueryDTO.getPageSize();

        PageHelper.startPage(pageNum, pageSize);

        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        long total = page.getTotal();
        List<DishVO> records = page.getResult();

        PageResult pageResult = new PageResult(total, records);

        return pageResult;
    }

    /**
     * 批量删除菜品
     *
     * @param ids
     */
    @Override
    public void deleteBatch(List<Long> ids) {
        // 判断当前菜品是否能够删除--是否在起售，是否有套餐关联
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus().equals(StatusConstant.ENABLE)) {
                // 当前菜品正在起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            // 当前菜品有套餐关联，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 删除菜品表中的数据
        /*for (Long id : ids) {
            dishMapper.deleteById(id);
            // 删除菜品口味表中的数据
            dishFlavorMapper.deleteByDishId(id);
        }*/

        // 根据菜品id集合批量删除菜品数据
        dishMapper.deleteBatch(ids);
        dishFlavorMapper.deleteByDishIds(ids);

    }

    /**
     * 根据id查询菜品和对应的口味数据
     *
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        // 1. 根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        // 2. 根据菜品id查询口味数据
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);

        // 3. 将两个数据封装到DishVO中并返回
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(flavors);

        return dishVO;
    }

    /**
     * 修改菜品
     *
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        // 修改菜品表基本信息
        dishMapper.update(dish);

        // 删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        // 插入新的口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 根据分类id查询菜品
     *
     * @param categoryId
     * @param name
     * @return
     */
    @Override
    public List<DishVO> getByCategoryId(Long categoryId, String name) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .name(name)
                .status(StatusConstant.ENABLE)
                .build();

        List<DishVO> dishes = dishMapper.getByCategoryId(dish);

        return dishes;
    }

    /**
     * 菜品起售停售
     *
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        // 有起售的套餐关联，不能停售菜品

        // 获取当前菜品的状态
        Integer dishStatus = dishMapper.getStatusById(id);
        // 判断是否关联了套餐
        int count = setmealDishMapper.getById(id);
        // 如果关联了套餐，判断当前套餐的状态，如果套餐为起售状态，则菜品不能停售
        if (count > 0) {
            int number = setmealDishMapper.getStatusByDishId(id);
            if (dishStatus.equals(StatusConstant.ENABLE) && number > 0) {
                throw new DishDisableFailedException(MessageConstant.DISH_BE_NOT_STOP);
            }
        }

        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


}
